Andoer M52-M42(17-31) 17mm-31mm M52 to M42 Mount Camera Lens Adapter Ring Macro Extension Tube Helicoid Lens Focusing Adapter Ring for Macro Photography - Walmart.com
Backscatter M52 Underwater 81° Wide Air Lens
Backscatter M52 Underwater 120° Wide Angle Lens
Backscatter M52 Underwater 81° Wide Air Lens
Pixco M52 Lens to M42 Camera Adjustable Focusing Helicoid Ring Adapter 25-55mm Macro Extension Tube M52-M42 25mm-55mm - AliExpress Consumer Electronics
Weefine Ultra-Wide Angle Conversion Lens with M52 thread - optimized for 24mm focal distan, threaded connector - Fantic
Amazon.com: Fiber Laser Machine Scanning Lens 110mm / 150mm / 175mm / 200mm Area F Theta Lens Thread: M52(110 x 110mm) : Industrial & Scientific